/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2008-2011, Salzburg Research. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * - Neither the name of the KiWi Project nor the names of its contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * Contributor(s):
 * sschaffe
 *
 * File Info:
 * User: sschaffe
 * Date: 2011/01/13
 * Time: 14:31
 *
 * Project: KiWi2, kiwi-core module
 */

package kiwi.social.webservices.tagging;

import kiwi.core.api.content.ContentItemService;
import kiwi.core.api.triplestore.ResourceService;
import kiwi.core.model.content.ContentItem;
import kiwi.core.model.rdf.KiWiTriple;
import kiwi.core.qualifiers.transaction.Transactional;
import kiwi.core.services.io.RdfJsonSerializer;
import kiwi.social.api.tagging.TaggingService;
import kiwi.social.model.tagging.Tag;
import org.slf4j.Logger;

import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.Response;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.LinkedList;
import java.util.List;

/**
 * Add file description here!
 * <p/>
 * User: sschaffe
 */
@ApplicationScoped
@Path("/social/tag")
@Produces({"application/json"})
@Transactional
public class TagWebService {


    @Inject
    private Logger log;

    @Inject
    private TaggingService taggingService;

    @Inject
    private ResourceService resourceService;

    @Inject
    private ContentItemService contentItemService;

    @Inject
    private RdfJsonSerializer rdfJsonSerializer;

    /**
     * List all tags in the KiWi system, i.e. all resources used for tagging other resources and their properties.
     *
     * The result is an RDF/JSON formatted list of triples.
     * @return
     */
    @Path("/list/all")
    @GET
    @Produces("application/json")
    public String listAllTags() {
        List<Tag> tags = taggingService.getAllTags();

        List<KiWiTriple> result = new LinkedList<KiWiTriple>();
        for(Tag tag : tags) {
            result.addAll(resourceService.listOutgoing(tag.getDelegate()));
        }
        return rdfJsonSerializer.serializeTriples(result);


    }


    /**
     * List the free tags in the KiWi system, i.e. those tags that are used for tagging but are not embedded in a SKOS
     * thesaurus.
     *
     * The result is an RDF/JSON formatted list of triples.
     *
     * @return
     */
    @Path("/list/free")
    @GET
    @Produces("application/json")
    public String listFreeTags() {
        List<Tag> tags = taggingService.getFreeTags();

        List<KiWiTriple> result = new LinkedList<KiWiTriple>();
        for(Tag tag : tags) {
            result.addAll(resourceService.listOutgoing(tag.getDelegate()));
        }
        return rdfJsonSerializer.serializeTriples(result);
    }


    /**
     * List the controlled tags in the KiWi system, i.e. those tags that are used for tagging and are not embedded in a SKOS
     * thesaurus.
     *
     * The result is an RDF/JSON formatted list of triples.
     *
     * @return
     */
    @Path("/list/controlled")
    @GET
    @Produces("application/json")
    public String listControlledTags() {
        List<Tag> tags = taggingService.getControlledTags();

        List<KiWiTriple> result = new LinkedList<KiWiTriple>();
        for(Tag tag : tags) {
            result.addAll(resourceService.listOutgoing(tag.getDelegate()));
        }
        return rdfJsonSerializer.serializeTriples(result);
    }


    /**
     * List the tags that the given resource is tagged with. The result is an RDF/JSON formatted list of triples.
     * @param taggedItemUri
     * @return
     * @throws URISyntaxException
     */
    @Path("/list/item")
    @GET
    @Produces("application/json")
    public Response listItemTags(@QueryParam("taggedItemUri") String taggedItemUri) throws URISyntaxException {
        // check syntax of URI
        URI uri = new URI(taggedItemUri);

        ContentItem item = contentItemService.getContentItemByUri(taggedItemUri);

        if(item != null) {
            List<Tag> tags = taggingService.getTags(item.getDelegate());

            List<KiWiTriple> result = new LinkedList<KiWiTriple>();
            for(Tag tag : tags) {
                result.addAll(resourceService.listOutgoing(tag.getDelegate()));
            }
            return Response.ok(rdfJsonSerializer.serializeTriples(result)).build();

        } else {
            return Response.status(Response.Status.NOT_FOUND).entity("The item with the URI "+taggedItemUri+" could not be found").build();
        }
    }
}
